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<TD ALIGN="LEFT"><A HREF="chapter6.html">Chapter 6</A></TD>
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<TABLE ID="T6-5" CLASS="majortable" FRAME="VOID" RULES="GROUPS" CELLSPACING="0" CELLPADDING="4" BORDERCOLOR="#ffffff">
<CAPTION>Table 6-5 Full-Duplex with Data Leads Only (FDX A) Signals</CAPTION>
<THEAD>
<TR VALIGN="BOTTOM">
<TH>Pin</TH>
<TH>Name (Mnemonic)</TH>
<TH>CCITT&nbsp;/ EIA</TH>
<TH>Switch</TH>
<TH>Description</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>1</TD>
<TD>Protective ground<BR>(PGND)</TD>
<TD>101/AA</TD>
<TD>-</TD>
<TD>Connects to terminal chassis. Also connects to external ground through third wire of power cord.</TD>
</TR>
<TR VALIGN="TOP">
<TD>2</TD>
<TD>Transmit data<BR>(TXD)</TD>
<TD>103/BA</TD>
<TD>S6</TD>
<TD>From VT102:<BR>When switch S6 is on (closed), TXD transmits serial characters and breaks
generated by terminal. TXD is in mark state when no characters are transmitted.</TD>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN="5"><P CLASS="note">NOTE: When S6 is on (closed), switch S7 must be off (open).</P></TD>
</TR>
<TR VALIGN="TOP">
<TD>3</TD>
<TD>Received data<BR>(RXD)</TD>
<TD>104/BB</TD>
<TD>-</TD>
<TD>To VT102:<BR>RXD receives serial characters from the computer.</TD>
</TR>
<TR VALIGN="TOP">
<TD>4</TD>
<TD>Request to send<BR>(RTS)</TD>
<TD>105/CA</TD>
<TD>S1</TD>
<TD>From VT102:<BR>When switch S1 is on (closed), RTS is on if terminal is on-line
and off if terminal is off-line.</TD>
</TR>
<TR VALIGN="TOP">
<TD>5</TD>
<TD>Clear to send<BR>(CTS)</TD>
<TD>106/CB</TD>
<TD>S2</TD>
<TD>To VT102:<BR>When switch S2 is on (closed), CTS is only used to turn CTS indicator
on or off. The on condition of CTS turns CTS indicator on; the off condition turns CTS
indicator off.</TD>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN="5"><P CLASS="note">NOTE: When S2 is on (closed), switch S3 must be off (open).</P></TD>
</TR>
<TR VALIGN="TOP">
<TD>6</TD>
<TD>Data set ready<BR>(DSR)</TD>
<TD>107/CC</TD>
<TD>-</TD>
<TD>To VT102:<BR>DSR turns DSR indicator on or off. The on condition of DSR signal turns
DSR indicator on; the off condition turns DSR indicator off.</TD>
</TR>
<TR VALIGN="TOP">
<TD>7</TD>
<TD>Signal ground<BR>(SGND)</TD>
<TD>102/AB</TD>
<TD>-</TD>
<TD>SGND is common ground reference potential for all connector signals except protective
ground. SGND connects to protective ground conductor.</TD>
</TR>
<TR VALIGN="TOP">
<TD>20</TD>
<TD>Data terminal ready<BR>(DTR)</TD>
<TD>108.2/CD</TD>
<TD>-</TD>
<TD>From VT102:<BR>DTR is on when the terminal is on-line and off when the terminal is
off-line or performing a line disconnect. When on, the modem can usually answer calls
(modem auto answer option). When off, the modem usually disconnects and does not
answer calls.</TD>
</TR>
<TR VALIGN="TOP">
<TD>23</TD>
<TD>Speed select<BR>(SPSD)</TD>
<TD>111/CH</TD>
<TD>S10</TD>
<TD>From VT102:<BR>SPSD is on when the receive speed SET-UP feature selection is greater
than 600 baud. SPSD is off when the speed is 600 baud or less.</TD>
</TR>
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<TD ALIGN="LEFT"><A HREF="chapter6.html">Chapter 6</A></TD>
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